Sanibel, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 19.8 °C (low) to 27.8 °C (high). Annual precipitation averages 1380.5 Millimeters. Sanibel is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.3 °C | 22.2 °C | 58.67 mm |
| February | 14.6 °C | 23.4 °C | 44.45 mm |
| March | 16.4 °C | 25.1 °C | 53.85 mm |
| April | 19.2 °C | 27.3 °C | 57.66 mm |
| May | 21.8 °C | 29.7 °C | 82.04 mm |
| June | 24.1 °C | 31.3 °C | 238 mm |
| July | 24.7 °C | 32 °C | 216.15 mm |
| August | 24.7 °C | 32.2 °C | 219.2 mm |
| September | 24.2 °C | 31.6 °C | 221.49 mm |
| October | 21.8 °C | 29.3 °C | 89.15 mm |
| November | 17.7 °C | 26.1 °C | 49.78 mm |
| December | 15.1 °C | 23.6 °C | 50.04 mm |
| Annual | 19.8 °C | 27.8 °C | 1380.48 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Aw - Tropical Savanna (Wet and Dry Climate) |